Reduce size of generated client libraries#3748
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Reduce the size of generated client libraries by deduplicating operation bodies. In my testing this reduces the size of client libraries by between 25% and 50% depending on the number of operations a service has. As an example
23M libaws-cpp-sdk-ec2-before.sobecomes14M libaws-cpp-sdk-ec2-after.so.I didn't touch the code generation for streaming methods as they're not very common and are alot harder to test than the request response operations.